Probability (P1 Exam Parctice) - More Sample Problems

The problems I am pulling are coming from theinfiniteactuary.com, but with a far better explanation. The site provides very valuable resources, including lessons and 7 sample exams that I downloaded back when I had the account. I am sharing 3 problems from each test (30 problems per test like usual).

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Example 1

The joint density of X and Y is


Find E[max(X,Y)].

To do this we need to graph our bounds and plot y=x for our other bounds. We get this (geogebra.com):


We then look at if the max is X or if the max is Y and add them together. So we use two sets of bounds and the formulas for EX + EY. The author usually integrates in the order of dydx, so I will do the same to stay consistent.

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Example 2

An insurance policy reimburses a loss up to a benefit limit of 20. If the distribution of a loss is exponential with mean 30, what is the expected value of the benefit paid under the policy?

Given the mean of 30 we have a distribution function and just need to integrate from 0 to 20.

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Another way to do the same problem given by the author:

Example 3

When I am sick, I like to count the buses that pass my house. I have noticed that the number of buses that pass can be modeled quite well by a Poisson random variable with mean 8 per hour from 8 until 10 am, and by a Poisson random variable with mean 5 per hour from 10 am until 2 pm. If exactly 5 buses drive past my house from 9:30-10:30 one morning, what is the probability that exactly 11 buses drove past from 9 to 11?

All we need to do is set up a Poisson distribution so that 6 buses pass by the house from 9-9:30 AM and 10:30-11 AM. This is not too bad since we have times and number of buses that should pass.
In the 30 minutes from 9-9:30 we have:


In the 30 minutes from 10:30 to 11 we have:
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